US3626145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic control of arc environment
Assignee: Armco Inc
•
Filing: 1970-02-02
•
Granted: 1971-12-07
•
Expires: 1990-02-02
Abstract
Abstract Control means for the arc of an automatic DC electric welding device comprising an electromagnet with its magnetic poles aligned perpendicular to the arc and the seam to be welded and providing a preselected and optimized magnetized environment for the arc. A Hall-effect probe is located immediately ahead of the welding arc to detect the magnitude and direction of the effect on the magnetic environment of detrimental magnetic fields in the immediate vicinity of the welding operation. The Hall-effect probe is connected through a detector circuit and a control circuit to the power supply for the electromagnet. Upon detection of the magnitude and direction of the effect of a detrimental magnetic field by the Hall-effect probe, appropriate adjustment is made of the power supplied to the electromagnet through the detector and control circuits, enabling the electromagnet to nullify the effect of the detrimental field on the preselected magnetic environment.
Inventors
- 👤 James F Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:24
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/06; B23K9/073; B23K9/0737
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
134 words
Control means for the arc of an automatic DC electric welding device of the type comprising a welding head and an electrode and adapted to weld a seam in metallic material, said control means comprising means for creating a magnetic field about said arc in an orientation perpendicular to said arc and to said seam, said magnetic field being so adjusted as to create an optimized magnetic environment about said arc to stabilize said arc and impart thereto a desired angle of impingement on said seam, means for adjusting the strength of said field, means for monitoring and indicating any deviation in said optimized magnetic environment and means for actuating said field-strength adjusting means in accordance with said indications of said monitoring means so as to maintain said optimized magnetic environment about said arc.
Claim 2
Dependent Claim
134 words
Control means for the arc of an automatic DC electric welding device of the type comprising a welding head and an electrode and adapted to weld a seam in metallic material, said control means comprising means for creating a magnetic field about said arc in an orientation perpendicular to said arc and to said seam, said magnetic field being so adjusted as to create an optimized magnetic environment about said arc to stabilize said arc and impart thereto a desired angle of impingement on said seam, means for adjusting the strength of said field, means for monitoring and indicating any deviation in said optimized magnetic environment and means for actuating said field-strength adjusting means in accordance with said indications of said monitoring means so as to maintain said optimized magnetic environment about said arc.
Claim 3
Dependent Claim
30 words
The structure claimed in claim 1 wherein said means for creating said magnetic field comprises an electromagnet, said electromagnet having pole pieces aligned perpendicular to said arc and said seam.
Claim 4
Dependent Claim
45 words
The structure claimed in claim 1 wherein said monitoring and indicating means comprises a Hall-effect probe, the output of said Hall-effect probe being connected to a field-strength meter, said Hall-effect probe being mounted in said magnetic environment ahead of said electrode in the welding direction.
Claim 5
Dependent Claim
16 words
The structure claimed in claim 1 including means to change the polarity of said magnetic field.
Claim 6
Dependent Claim
47 words
The structure claimed in claim 2 wherein said monitoring and indicating device comprises a Hall-effect probe, the output of said probe being connected to a field-strength meter, said probe being mounted on a centerline between said pole pieces and ahead of said electrode in said welding direction.
Claim 7
Dependent Claim
28 words
The structure claimed in claim 5 wherein said means for adjusting the strength of said field comprises a variable power source connected to the coil of said electromagnet.
Claim 8
Dependent Claim
55 words
The structure claimed in claim 6 wherein said means for actuating said field-strength adjusting means comprises means for varying the output of said variable power supply, said actuating means being responsive to a small signal voltage, said field strength meter supplying said small signal voltage in proportion to the output signal of said Hall-effect probe.
References Cited (Backward Citations)
US1792243A
Cited
US2702846A
Cited
US2971079A
Cited
US2994763A
Cited
US3076889A
Cited
US3268805A
Cited
US3551637A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |